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___________ was the first planet in the solar system to be visited by a Spacecraft.

1. Mercury
2. Venus
3. Mars
4. Jupiter

The ans. is option B) Venus.

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Venus was the first planet beyond Earth visited by a spacecraft (Mariner $2$ in $1962$), and the first to be successfully landed on (by Venera $7$ in $1970$).

So, the correct answer is $(B).$
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